public class ThreadDemo1 {
    public static int count=0;
    public static void main(String[] args) throws InterruptedException {
        Object locker=new Object();
        Thread t1=new Thread(()->{
            for (int i=0;i<50000;i++){
               synchronized (locker){
                   count++;
               }
            }
        });

        Thread t2=new Thread(()->{
            for (int i=0;i<50000;i++){
                synchronized (locker){
                    count++;
                }
            }
        });


        t1.start();
        t2.start();

        t1.join();
        t2.join();

        System.out.println("count="+count);
    }
}
